use action view erubis for rails 3

Change-Id: I1f9cb0a894ce7a1af63b03d432396f7d911c5bf6
Reviewed-on: https://gerrit.instructure.com/29790
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Cody Cutrer <cody@instructure.com>
Product-Review: James Williams  <jamesw@instructure.com>
QA-Review: James Williams  <jamesw@instructure.com>